AVC系统晶闸管与SF6开关电容投切技术研究

doi:10.16180/j.cnki.issn1007-7820.2019.06.010

Abstract

Abstract:

With the commissioning of the AVC system, the switching of the capacitor in the substation was more frequent. The conventional switching capacitor SF6 switching frequency is low, and it fails to meet the reactive power compensation requirements in the switching gap, limiting the role of the capacitor. In order to solve the above problems, a compound switch structure was proposed, which combined mechanical switching and electronic switching to form a combined switching scheme of thyristor and SF6 switch. The working principle of thyristor & SF6 switching capacitor was introduced and the switch control strategy was analyzed in this paper. Through a reasonable switching strategy, mutual protection of the thyristor and the SF6 switch was realized, so that the thyristor could withstand high voltage when blocked, and also avoided frequent operation of the SF6 switch in the case of high-frequency switching, thereby prolonging the service life of the device. Finally, the rationality and feasibility of the compound switch were verified by PSIM software simulation.

Key words: AVC SAVC system, TSC, SF6 switch, PSIM, compensating capacitor, switching frequency

CLC Number:

TN710

WANG Canxia,CHNEG Jia,XIAO Xia,SUN Jing. Research on Switching Technology of Thyristor and SF6 Switch Capacitor in AVC System[J].Electronic Science and Technology, 2019, 32(6): 49-54.

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参量		取值
TSC容量	TSC1	3 000 Var
	TSC2	6 000 Var
	TSC3	12 000 Var
负载变化范围	3 000~21 000 Var

Research on Switching Technology of Thyristor and SF6 Switch Capacitor in AVC System

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